Time counter 974A CCNIM

digitalelectronicprogrammable

Four 8-decade counters with full computer control and readout (CCNIM™) One counter that can function as a presettable timer or counter One counter can function as a timer 100-MHz negative or 25-MHz positive input count rate RS-232-C interface Crystal-controlled time base Auto Recycle dwell time control The ORTEC Model 974A is a four-channel, 100-MHz Counter/Timer in a CCNIM™ (computer-controlled NIM) package. It can be computer-controlled or manually operated. The Model 974A may be used as a three-channel counter with one presettable timer, a four-channel counter (one counter channel presettable), or as a three-channel counter (one counter channel preset-table) with one timer. Any one of the four 100-MHz counter/timer channels can be monitored on the large, 8-decade LED display. In addition to the four 100-MHz channels, the Model 974A incorporates an 8-decade, presettable Event counter that can only be controlled or read through the computer interface. Standard computer interfaces built in to the Model 974A include the RS-232-C and 20-mA loop. The command format adheres to the Standard NIM Digital Bus, an easy-to-use language for programming NIM instruments. All front-panel functions (with the exception of Display Test) may be remotely controlled via a computer or dumb-terminal. In addition, several functions not accessible via the front panel are accessible with the computer interfaces. The front panel may be locked out by the ENABLE_REMOTE command from a computer.